Changer.



No. 7I5,902. Patented Dec. I6, |902.

.L Tuomson.

CHANGER.

'Application tiled Mar. 10, 1902.;

(No .Modem Y WWW/#lm @Manuf JOI'IN THOMSON, OF BROOKLYN, NEW PRESS COMPANY, OF JERSEY CITY, A CORPORATION OF NEW JERSEY.

CHAN

PATENT OFFICE- YORK, ASSIGNOR TO JOHN THOMSON NEW JERSEY, AND NEW YORK, N. Y.,

GER.

SPECIFICATION forming part of Letters Patent No. 715,902, dated December 16, 1902.

Application iiled March 10I 1902.

To @ZZ whom it may concern:

Be it known that I, JOHN THOMSON, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Changers, of which the following is a specication.

My invention relates to ink-distributing devices for printing-presses, and more particularly to the self-contained type of distributing-roller known as the duplex screw-distributer or changer, and has for its object to improve the construction of such changers; and it consists in a changer embodying the features of construction and arrangement of parts substantially as hereinafter more particularly' set forth.

In the accompanying drawings, Figure l is a longitudinal vertical central section of the changer complete. Fig. 2 is an enlarged transverse section, and Fig. 3 is a perspective view of the crescent or switch.

In previous practice in the construction of devices of this character it has been common to provide the shaft with an operating screwthread and to provide the sleeve with a switch or crescent, which is arranged to coperate with the operating-screw on the shaft. Various modifications of this general construction are known, and some of themare set forth more particularly in my prior applications, Serial No. 88,764, led January 7, 1902, and Serial No. 94,100, filed February 14, 1902.

In my present construction I provide a shaft D and mount thereon in any suitable way a sleeve B. This sleeve is provided in its inner surface with an operating-screw b, which is shown in the well-known form of an endless screw-thread adapted .to produce a continuous reciprocating motion in connection with the proper switch or crescent. The shaft D is in this case provided with a switch or crescent E, the outer surface e of which is convex and of a form adapted to coperate with the screw b. This switch or crescent is provided with a spindle E' on its concave side, which spindle is mounted in an opening d in the shaft D, and it is so arranged as to be capable of more or less free oscillation in its seat in the opening.

Serial No. 97,586. (No model.)

In order to assemblevthe parts in the present instance, the sleeve is provided with a bushing F, forming a bearing for the shaft, and this can be secured in the sleeve in any suitable way, as by a screw f. The sleeve is also preferably provided with an internal rib B', which tends to aid in confining the lubricant inthe portion of the sleeve adjacent to the screw. In order to assemble these parts, the bearing of the shaft D in the end B2 must be of such a character as to permit a slight deiiection of the shaft when the bushing F is removed, so that the switch may be withdrawn from the screw.

The advantages of this construction will be apparent to those skilled in the art, and it will be seen that by supplying a proper lubricant to the interior of the sleeve the threads of the screw are continuously and thoroughly lubricated, so that the least friction is produced.

While I have shown in the drawings a preferred embodiment of my invention, it is evident that the details can be varied by those skilled in the art without departing from the spirit of the invention, and while there is shown one screw and one spindle for operating the sleeve there may-bea duplication thereof, and while I have shown the screw and spindle arranged at the inner end of the sleeve they may be otherwisev arranged.

What I claim is- The combination with a changer-shaft and a switch having a Abearing in the shaft, of a changer-sleeve mounted on the shaft, to be revolved continuously in one direction, said sleeve having an operating-screw upon its inner surface engaged by the switch to reciprocate the revolving sleeve upon the shaft, substantially as described.

In testimony whereof I have signed my name to this speciication in the presence of two subscribing witnesses.

JOHN THOMSON.

Witnesses:

SAML. H. WEBB, HELEN M. BLANOHEIELD. 

